They don't say that's what they are doing, but it is in fact what they base their assumptions on because the things they talk about weren't the social dynamics of the Paleolithic as they claim, they are the social dynamics of patriarchy (from just a few thousand years).

Read this excellent piece from Scientific American that goes into even further depth than I do about why evolutionary psychology is so preposterous.

https://www.scientificamerican.com/article/four-fallacies-of-pop-evolutionary-2012-12-07/